Classify quadrics : independant sphere

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33222 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Parse piecewise back from CAS

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33223 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e